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Commitments and contingencies - Additional Information (Detail) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 15, 2018 USD ($) | Sep. 04, 2018 USD ($) shares | Dec. 31, 2018 CAD ($) shares | Jul. 17, 2018 USD ($) | Jul. 31, 2015 CAD ($)
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Research fund |  |  | $ 2,350 |  |
Research and Development Agreement [member] | Ginkgo Bioworks Inc. [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Aggregate value of shares issuable |  |  |  | $ 100,000 |
Milestones Payment |  | $ 22,000 |  |  |
Research and Development Agreement [member] | Technion [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Research fund | $ 1,784 |  |  |  |
Research funding commitment period | 3 years |  |  |  |
Cash payments | $ 4,900 |  |  |  |
Research and Development Agreement [member] | MedCann Access Acquisition Claim [member] | Peace Naturals [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Claims related to contingencies |  |  |  |  | $ 15,000
Provision for loss recognized |  |  |  |  | $ 0
Research and Development Agreement [member] | Warrants Claim | Peace Naturals [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Claims related to contingencies |  |  | 125 |  |
Claim related contingencies to related party |  |  | 300 |  |
Research and Development Agreement [member] | Former employees' unlawful termination claims [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Claims related to contingencies |  |  | $ 580 |  |
Number of options claimed | shares |  |  | 30,000 |  |
Research and Development Agreement [member] | Former employees' unlawful termination claims [member] | Peace Naturals [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Claims related to contingencies |  |  | $ 12,682 |  |
Percentage of equity interest claimed |  |  | 10.00% |  |
Top of Range [member] | Research and Development Agreement [member] | Ginkgo Bioworks Inc. [member] |  |  |  |  |
Disclosure Of Contingent Liabilities [Line Items] |  |  |  |  |
Number of common shares issuable | shares |  | 14,700,000 |  |  |

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